code: def get(self, next_flag=True):  # pragma: no cover
      # next_flag is for retrieve the first element in the grid space.
      raise NotImplementedError
  
imports: import abc
  import logging
  from ast import literal_eval
  from math import floor
  from six.moves import reduce, input
  from .AbstractProposer import AbstractProposer
  from ..utils import check_missing_key, get_from_options
label_desc: Use image node_id 2 for calling the _AbstractGen obj's underlying member method code with example usage: obj.get(next_flag) without return types